Vanhanen, Tatu
Prospects of democracy : a study of 172 countries
Routledge, 1997
 Buku Teks
Pennock, J. Roland
Liberal Democracy its merits and prospects /J. Roland Pennock
Rinehart and Company, 1950
 Buku Teks
Prospects
Paris : The United Nations Educational
 Majalah, Jurnal, Buletin
Arblaster, Anthony
Democracy
Open University Press, 1987
 Buku Teks
Democracy
Oxford University Press, 1995
 Buku Teks